Portable clamp



A. ANTHONY.

PORTABLE CLAMP.

APPLICATION FILED DEC H, I919. 1,347,360. Patent d July 20,1920.

2 SHEEIS-SHEET l.

- WITNESSES INVENTOR A1015 ANIHONY;

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A TTOR/VE Y8 A. ANTHONY.

PORTABLE CLAMP.

APPLICATION FILED 050.11. 1919.

1,347,360. Patented uly 20, 1920.

2 SHEEISSHEEI 2- WITNESSES INVENTOI? A 018 A/Vmo/vy,

iamd 4 TTORNEYS UNITED STATES PATENT OFFICE.

PORTABLE CLAMP.

Specification of Letters Patent.

Patented July 20, 1920.

Application filed December 11, 1919. Serial No. 344,069.

To all whom it may'conccrn:

Be it known that I, ALoIs ANTHONY, a citizen of the United States, and aresident of the city of Baltimore, in the State of Maryland, haveinvented certain new and useful Imprcvements in Portable Clamps, ofwhich the following is a specification.

My invention relates to portable clamps used in wood working, and apurpose of my invention is the provision of a simple and efiicient clampof the type comprising a stationary jaw and a movable jaw, and camactuating means for securing the movable jaw in any adjusted position.

It is also a purpose of my invention to provide a clamp of thischaracter in which one of the cams effects a depression of one end ofthe movable jaw while the other cam effects an elevation of the oppositeend, whereby the movable jaw is caused to securely clamp a piece ofwork.

I will describe one form of clamp embodying my invention, and will thenpoint out the novel features thereof in claims.

In the accompanying drawings:

Figure 1 is a view, showing in side elevation, with parts broken away,one form of clamp embodying my invention;

Fig. 2 is a longitudinal sectional view, taken on the line 2--2 of Fig.1;

Fig. 3 is a view, showing in elevation the rear end of the clampshown-in the preceding views;

Fig. 4L is a longitudinal sectional view,

taken on the line 44 of Fig. 1, and looking in the direction of thearrows;

Figs. 5, 6, 7 and 8, are detail views of certain parts of the clampshown in the preceding views.

Similar referencecharacters refer to similar parts in each of theseveral views.

Referring specifically to the drawings, and particularly to Fig. 1, Jdesignates a stationary jaw and J a movable jaw, each of which is formedof wood in the present instance and have the general outline of the jawsof a conventional form of clamp of this type. The stationary jaw J isprovided with a pair of beams 15 and 15 which are disposed in spacedparallel relation to each other, with their rear sides formed withserrations 16 and 16 respectively. These beams 15 and 15 may be formedof Wood and are preferably of rectangular formation in cross section, asclearly shown in Fig. 2.

The movable jaw J is provided with suitable openings to slidably receivethe beams 15 and 15 whereby the jaw as a unit is capable of adjustmenttoward and away from the stationary jaw J. Formed in the outer side ofthe movable jaw J at a point between the openings for the beams 15 and15 is a pocket 17 which communicates with the opening for the beam 15 atone end and with a pair of diagonally disposed slots 18 (Fig. l) andeffect a communication between a pocket and the opening for the beam 15.Extending through the slots 18 and the pocket 17 are a pair of links 19and 19 which are fulcrumed intermediate their ends by a pin 20 thatextends transversely through the jaws J and the pocket 17. The links 19and 19 are provided with registering slots 21, through which the pin 20loosely extends. It will be noted that these slots are of suflicientlength to allow of a limited amount of lateral and longitudinal play ofthe links for the purpose of permitting the latter to properly functionin clamping of the movable jaw J, as will be more fully explainedhereinafter.

shown 1, the opposite ends of the links 19 and 19" extend to theopposite sides of the J in a manner to embrace the beams 15 and 15 at apoint adjacent the jaw. The outer or upper ends of the links 19 and 19are connected by a cam lever C, while the lower ends of the links areconnected by a cam lever C. As illustrated to advantage in Fig. 5, thelever C comprises a head 22 eccentrically mounted upon the links 19 and19 by a pin 23, such head being slotted, as at 22 to receive the beamends. The head 22 is provided with a handle 24: by means of whichrotation of the head is effected for moving the cam into active orinactive position. The cam lever C is similar in construction to thelever C in that it comprises a head 25 eccentrically mounted upon a pin26 which extends through the lower ends of the links 19 and 19. As shownin Fig. 6, the head 25 is provided with a handle 27 for rotating thehead about the pin 26 as a center. The head 25 is provided with a slot25 which is adapted to receive a locking dog 28, as clearly shown inFig. 3, such dog being provided with serrations adapted to engage theserrations 16 of the beam 15.

Pivoted upon the pin 20 and disposed within the pocket 17 is a pawl 29,the free end of which is serrated for engagement plates 80 and 31secured in recessed portions formed in the jaw, as clearly shown inFigs. landt.

In the operation of the clamp, the aw J is free to slide upon the beams15 and 15 when the cam levers C and C are in inactive positions. Asshown in Fig. 1, the cam levers arenin the active position, wherein theheads 22 and 25 bear against the plates '30 and 31, respectively in suchmanner that the head 22 forces the forward end of the jaw J in thedirection of the jaw J while the'head 25 forces the rear end of the jawJ upwardly and away from the jaw J. The head 22 also bears against theforward side ofthe beam 15 thus exerting a rearward pressure" on thebeam and causing the .same' to engage the forward end of the [pawl 29.30

The length and position of the pawl 29 is such that it functions as abrace forthe beam 15 to prevent rearward movementof the latter which ineffect causes a forwardmovement of the jaws J and J. Under thismovement, the links 19 and 19 are drawn'forwardly and upwardly, therebythrowing the dog 28 into engagement with the serrated surface of thebeam 15, it being understood. that the slots 21 provide for thismovement of the links. This position of the links is maintained solongas the cam lever C occupies the active position, and becausefo f thedisposition of the pawl 29 and the dog 28, it will be evident that theserrations 16 of the beam 15" coact -with the serrations of the pawl29'to prethe serrations 16 of'the beam 15 coact with the serrations ofthe dog'28 which prevent "downward movement of the jaw J. As a result ofthese functions, the ca-m levers C and G are caused-to rock the movablejaw 'J" in the manner prevlously VClBSCI'IbBCl and to thereby force theaw 1nto firm engagement with any piece of work which is interposedbetween the two jaws.

' To effect a release of the clamp from a" pieceof work, it is obviousthat by moving theha'ndle 24in a vertical position and the handle 27downwardly to a vertical position opposite to that which. it occupiesinFig. 1, the heads 22 and 25v are moved to disengage the jaw J-and'the' beam 15 thereby allowwith the work.

It will be manifest from the foregoing description that I have provideda wood working clamp of simple and efh'cient construction'whicheliminates the employment of screws, and in their place cam levers aresubstituted which permit'ofthe quick adjustment of the movable jaw to apiece of work and a secure clamping of the same in active position. 7 V7 Although I have herein shown and described only one form of clampembodying my invention, it is to be understood that various changes andmodifications may be made herein without departing from the spirit ofthe invention and the spirit and scope'of the appended claims,

Having thus described my invention, I claim:

1. A wood workingclamp comprising a stationary jaw, beams carried bysaid jaw, a movable aw slidable on said beams, links pivoted ;onthelmovable j aw, and cam levers carriedby said links and engageablewith the opposite sides of-the movable jaw for effecting when operatedamovement on the forward end of the movable jawrtoward the stationaryjaw, and a rearwardmovement ofthe opposite end of the movable jaw awayfrom the stationary jaw,

2. A wood working-clamp comprising a stationary jaw, beams carried bythe stationarj jaw, a movable jaw sli'dable on said beams, links carriedby the movable jaw and extending to the opposite side thereof,camspivoted on saidlinks at the opposite sides of the movable jaw, apawl pivoted to the movable jaw and adapted to engage one of'the' beams,and a dog carried by one of ctheendsv of said links and adapted toengage the other beam for the purpose described.

a movable jaw slidable on said bea -ms, links ,movably mounted on themovable jaw and extending to the opposite sides thereof,cams

pivoted to, the opposite ends ofsaid links,

a pawl: pivoted on the movable'jaw and engageable' with one ofthe beams,a dog 7 mounted on one of, the ends of said links and engageable withthe other bea-m,'and serrations formed on saidpawhdog and beams in amanner to prevent movement of the m'ox' able jaw upon said beamswhen thepawl and dog, are in active position.

V ii'Lois ANTHONY.

